Migracijska i izbjeglička kriza – sigurnosni rizici za EU

Migracijska i izbjeglička kriza – sigurnosni rizici za E

Migracijska i izbjeglička kriza – sigurnosni rizici za EU

Migracijska i izbjeglička kriza – sigurnosni rizici za E

Analiza difuzije metala iz krunice u zub nosač

Proton induced X-ray emission spectroscopy (PIXE) has been used to determine the intensity of metals from crowns in human teeth. In order to measure elements distribution across the tooth section, proton beam (3 MeV) has been collimeted to provide a spatial resolution of 300 jj,m. The samples were selected according to the time of insertion of crowns and the kind of alloys they were made of. The results show the intensities of gold, zinc and copper in abutment teeth. It was not found any intensity of paladium and amount of silver was not significant.Tehnikom emisije karakterističnih X-zraka, inducirane protonima (PIXE) pokušalo se dokazati difuziju iona metala iz krunice u zub nosač. Distribucija elemenata kroz dentin zuba mjerena je kolimiranim snopom protona (3 MeV), čime se želejlo osigurati prostornu rezoluciju od 300 m, tj. što bolje razlikovanje detalja. Uzorci su selekcionirani s obzirom na trajnost krunica, kao i vrstu legura od kojih su krunice izlivene. Mjerenjima su utvrđeni intenziteti zlata, cinka i bakra u zubima nosačima, dok intenzitet paladija nije nađen. Za tragove srebra može se reći da su beznačajni

Monitoring ion track formation using in situ RBS/c and ERDA

The aim of this work is to investigate feasibility of the ion beam analysis techniques for monitoring swift heavy ion track formation. First, use of the in situ Rutherford backscattering spectroscopy in channeling mode to observe damage build-up in quartz SiO2 after MeV heavy ion irradiation is demonstrated. Second, new results of the in situ grazing incidence time-of-flight elastic recoil detection analysis used for monitoring the surface elemental composition during ion tracks formation in various materials are presented. Ion tracks were found on SrTiO3, quartz SiO2, a-SiO2 and muscovite mica surfaces by atomic force microscopy, but in contrast to our previous studies on GaN and TiO2, surface stoichiometry remained unchanged

Interpretative and predictive modelling of Joint European Torus collisionality scans

Transport modelling of Joint European Torus (JET) dimensionless collisionality scaling experiments in various operational scenarios is presented. Interpretative simulations at a fixed radial position are combined with predictive JETTO simulations of temperatures and densities, using the TGLF transport model. The model includes electromagnetic effects and collisions as well as (E)over-right-arrow x (b)over-right-arrow shear in Miller geometry. Focus is on particle transport and the role of the neutral beam injection (NBI) particle source for the density peaking. The experimental 3-point collisionality scans include L-mode, and H-mode (D and H and higher beta D plasma) plasmas in a total of 12 discharges. Experimental results presented in (Tala et al 2017 44th EPS Conf.) indicate that for the H-mode scans, the NBI particle source plays an important role for the density peaking, whereas for the L-mode scan, the influence of the particle source is small. In general, both the interpretative and predictive transport simulations support the experimental conclusions on the role of the NBI particle source for the 12 JET discharges.Peer reviewe